Omar Mateen, 29, was identified as the shooter by his ex-wife. He was later gunned down by police.

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(Image: PA)

ISIS later claimed responsibility for the shooting.

Mina Justice, Eddie's mother

“The armed attack that targeted a gay night club in the city of Orlando in the American state of Florida which left over 100 people dead or injured was carried out by an Islamic State fighter,” Amaq News Agency reported.

(Image: Getty Images)

Investigators examine the scene of Pulse (Image: Getty Images)

The claim came after the FBI said there were "suggestions" gunman Mateen had "leanings" towards radical Islamic terrorism.

It also follows reports that Mateen called 911 and pledged allegiance to the head of ISIS before the attack.